Volume 19, Issue 1 (2019)                   Modares Mechanical Engineering 2019, 19(1): 85-93 | Back to browse issues page

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Hajibagheri H, Heidari A, Amini R. Experimental Relationship of Yield and Tensile Strengths with Hardness in High Strength APIX70 Steel Pipes. Modares Mechanical Engineering. 2019; 19 (1) :85-93
URL: http://journals.modares.ac.ir/article-15-23255-en.html
1- Mechanical Engineering Department, Mechanical Engineering Faculty, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran
2- Mechanical Engineering Department, Mechanical Engineering Faculty, Khomeinishahr Branch, Islamic Azad University, Isfahan, Iran , heidari@iaukhsh.ac.ir
3- Materials Science & Engineering Department, Materials Science & Engineering Faculty, Shiraz University of Technology, Fars, Iran
Abstract:   (1369 Views)
Determining yield and tensile strengths is of utmost importance for engineers in identifying and examining the mechanical properties of pipelines. However, performing a tensile test requires sampling and is, therefore, time-consuming. Thus, it is essential to use an accessible and convenient parameter in order to investigate the relationship between yield and tensile strengths. Hardness can prove to be the parameter we are seeking. The present study used 10 gas transmission pipelines (grade X70, straight seam welded, outer diameter: 1422.2mm, and thickness: 15.9mm) in order to perform chemical analyses, impact tests (base metal, weld, HAZ), microstructural examinations, using an optical microscope, indentation hardness tests (base metal, weld, HAZ), and tensile tests. The minimum, maximum, mean, probability density function, and standard deviation of hardness, yield strength in base metal, and tensile strength in weld and base metal were obtained and compared with API 5L standard. The data were used to determine the relationship between strength and hardness. The results prove to be a reliable measure in order to estimate the strength of base metal in pipelines, which reduces the costs and the time needed in order to achieve an optimal strength.
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Received: 2018/07/19 | Accepted: 2018/09/30 | Published: 2019/01/1

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